Well, Rstudio Cloud is a really great initiative!
Today I wanted to see how it would work using my iPad as I left my laptop at work. I think it would be truly productive if the iPad and other tablets would be supported. Not for long and complicated analysis, but for things like
- quick changes, e.g. in the field
- jotting down and trying ideas while away from a real
computer - presentations
- just having the iPad option
So, it looks good and familiar 
Unfortunately, most of the keys do not work. E.g. ESC, Ctrl, arrow keys. This applies to both the software and Bluetooth keyboard. (everything works in this input field).
Best,
Per